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研究了溴化十六烷基吡啶(CPB)和KI分离Pt(Ⅳ)的行为及与一些金属离子分离的条件。结果表明,在水溶液中,Pt(Ⅳ)与CPB和KI形成不溶于水的三元缔合物PtI62-.2CPB+,此三元缔合物沉淀浮于水相上层形成界面清晰的液-固两相。当溶液中CPB和KI的浓度分别为3.5×10-3mol/L和2.0×10-2mol/L,pH2时,Pt(Ⅳ)可与V(Ⅴ),Zn(Ⅱ),Mn(Ⅱ),Sn(Ⅳ),Al(Ⅲ),W(Ⅵ),Ni(Ⅱ),Co(Ⅱ),Fe(Ⅱ)和Mo(Ⅵ)离子定量分离,本法用于Ni-Pt/Al2O3催化剂中Pt(Ⅳ)的分离和测定,平均回收率为99.0%,RSD为1.8%(n=7)。
The behavior of Pt (Ⅳ) and separation from some metal ions by cetyl pyridinium bromide (CPB) and KI were studied. The results show that Pt (Ⅳ) forms insoluble water-soluble ternary association PtI62-.2CPB + with Pt (Ⅳ) and CPI in aqueous solution. The ternary complex precipitates in the aqueous phase and forms a clear liquid- phase. When the concentrations of CPB and KI in the solution were 3.5 × 10-3 mol / L and 2.0 × 10-2 mol / L, respectively, pH (Ⅴ), Zn (Ⅱ), Mn (Ⅱ) This method was applied to the quantitative separation of Sn (Ⅳ), Al (Ⅲ), W (Ⅵ), Ni (Ⅱ), Co (Ⅱ), Fe (Ⅱ) and Mo (Ⅵ) (Ⅳ). The average recovery was 99.0% and the RSD was 1.8% (n = 7).